diff mbox series

[5.12,031/384] spi: stm32-qspi: fix pm_runtime usage_count counter

Message ID 20210510102015.897829538@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman May 10, 2021, 10:17 a.m. UTC 
From: Christophe Kerello <christophe.kerello@foss.st.com>

commit 102e9d1936569d43f55dd1ea89be355ad207143c upstream.

pm_runtime usage_count counter is not well managed.
pm_runtime_put_autosuspend callback drops the usage_counter but this
one has never been increased. Add pm_runtime_get_sync callback to bump up
the usage counter. It is also needed to use pm_runtime_force_suspend and
pm_runtime_force_resume APIs to handle properly the clock.

Fixes: 9d282c17b023 ("spi: stm32-qspi: Add pm_runtime support")
Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210419121541.11617-2-patrice.chotard@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/spi/spi-stm32-qspi.c |   18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)
diff mbox series

Patch

--- a/drivers/spi/spi-stm32-qspi.c
+++ b/drivers/spi/spi-stm32-qspi.c
@@ -727,21 +727,31 @@  static int __maybe_unused stm32_qspi_sus
 {
 	pinctrl_pm_select_sleep_state(dev);
 
-	return 0;
+	return pm_runtime_force_suspend(dev);
 }
 
 static int __maybe_unused stm32_qspi_resume(struct device *dev)
 {
 	struct stm32_qspi *qspi = dev_get_drvdata(dev);
+	int ret;
+
+	ret = pm_runtime_force_resume(dev);
+	if (ret < 0)
+		return ret;
 
 	pinctrl_pm_select_default_state(dev);
-	clk_prepare_enable(qspi->clk);
+
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0) {
+		pm_runtime_put_noidle(dev);
+		return ret;
+	}
 
 	writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR);
 	writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR);
 
-	pm_runtime_mark_last_busy(qspi->dev);
-	pm_runtime_put_autosuspend(qspi->dev);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
 
 	return 0;
 }